Two billion people now watch YouTube, yet its stars are a mystery to the general public and media. What is the secret of their appeal? How do they cope with being in front of the lens? And who is behi
Jake Paul, KSI, PewDiePie and Zoella are mega-stars to the young and a mystery to the old. As YouTubers, they influence the views, lives and purchases of millions of fans. And their power is growing:
